There is always a FPS variance when it comes to releasing Green Gas from a magazine. It is more of a question of consistency, which we did not test because the prototype version is not a finished product or production sample.

I should rephrase it: How wide is the FPS variance?
My PTP starts at 360 and goes down to 295 on the last (24th) shot, indoors.

Will the Magpul lower receiver be compatible with the Magpul BAD lever?

As far as I can tell the PTS receiver is based on the "B" series limited run Magpul lower, which does not feature ambi controls, and has protrusions near the trigger area that seem to prevent the operation of a BAD lever.

Allizard can you confirm if the Magpul lower is compatible with the BAD lever? I'm already planning out builds.. I was going to get the vanilla LM4 but if the Magpul can take a BAD lever I might consider it.

Interesting. Everyone is fascinated by these magical elves and no one wants to know or say if the Magpul lower receiver will accept a BAD lever. Maybe because they think it's a silly question? Of course Magpul products would work with everything Magpul... right?

Well, maybe I should be perfectly clear and explain why this is a legitimate question.

To make a pretty long story short, Magpul released a very limited run (~800) of billet lower receivers in 2008 in 3 configurations:
Series A: ambidextrous controls (Norgon/POF)
Series B: no ambi controls
Series C: no ambi controls, custom rollmarks (given to friends/family of Magpul)

Then the BAD lever is developed AFTERWARDS in 2009. And no one ever gave any thought to compatibility with the lowers since most were Series A and already had ambi controls, and the entire run was very limited (some of these go for thousands of dollars on gunbroker)

Airsofters get the Series B style lower from G&P/Prime/PTS, which is what the KWA's are clearly shipping with.

Now the issue with the MPLs (Magpul Lowers) is that they have protrusions in the trigger area which are presumably finger rests for stowing your trigger finger when not firing. This protrusion is directly where the BAD lever travels and could potentially interfere with its operation. In fact here is someone saying that their airsoft MPLB is NOT accepting a BAD lever: http://www.airsoftso...oes-work-13705/